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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
The San Tan Valley Census Designated Place had a population of 91,177 as of July 1, 2015. San Tan Valley ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Arizona. See peer rankings below.